28440993458 has 4 divisors (see below), whose sum is σ = 42661490190. Its totient is φ = 14220496728.

The previous prime is 28440993443. The next prime is 28440993473. The reversal of 28440993458 is 85439904482.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (28440993443) and next prime (28440993473).

It can be written as a sum of positive squares in only one way, i.e., 28248533329 + 192460129 = 168073^2 + 13873^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7110248363 + ... + 7110248366.

Almost surely, 2^28440993458 is an apocalyptic number.

28440993458 is a deficient number, since it is larger than the sum of its proper divisors (14220496732).

28440993458 is a wasteful number, since it uses less digits than its factorization.

28440993458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14220496731.

The product of its (nonzero) digits is 9953280, while the sum is 56.

The spelling of 28440993458 in words is "twenty-eight billion, four hundred forty million, nine hundred ninety-three thousand, four hundred fifty-eight".